Submission #975933

#	Time	Username	Problem	Language	Result	Execution time	Memory
975933		vjudge1	Star triangles (IZhO11_triangle)	C++17	100 / 100	414 ms	9200 KiB

triangle

#include <bits/stdc++.h>
#define int long long
using namespace std;

signed main (){
	int n,ans = 0; cin >> n;
	map<int,int> x;
	map<int,int> y;
	pair<int,int> arr[n+1];
	for(int i =0;i<n;i++){
		int u,v; cin >> u >> v;
		x[u]++;
		y[v]++;
		arr[i] = {u,v}; //x,y
	}
	for(int i = 0;i<n;i++){
//		cout << arr[i].first << " " << x[arr[i].first] << " | " << arr[i].second << " " << y[arr[i].second] << endl;
		ans += (x[arr[i].first]-1) * (y[arr[i].second]-1);
	}
	cout << ans << endl;
	
	return 0;
}

• Subtask 1: 100 / 100